Sawtooth Traverse

Weather is about as good as it gets for a late-May Idaho traverse. Highs climbing from 63°F today to 72°F by Sunday, overnight lows holding in the mid-40s, winds light at 3–13 mph out of the SW/S the whole trip. No precip in the forecast, essentially zero. You've got nearly 15 hours of daylight with sunset at 9:08 PM, so timing is flexible — but that also means maximum solar heating on snow slopes by early afternoon.

Avalanche data is unavailable for this zone, which is the one thing worth noting. With 31 inches of snowpack still present in late May and daytime highs pushing into the low 70s by Sunday, wet loose avalanche activity on steep south and west aspects is a real possibility in the afternoons. The warming trend is gradual enough that you're unlikely to be dealing with major slides, but any steeper snow travel on slopes above roughly 30 degrees should happen in the morning before solar radiation softens the surface crust. Be off steep snow by noon on Sunday when the 72°F high will be doing the most work. North-facing slopes will hold firmer snow longer and are safer for technical traverses.

Stream crossings look benign. The available USGS gauges are showing normal to slightly below-normal flows — Salinas near Bradley is running 103% of median, stable. None of the gauges are flagging elevated snowmelt pulses. That said, gauges used in this briefing are not direct on-route stations, so expect afternoon flow spikes on any channels draining south or west aspects as the warm days pile up. Cross major drainages in the morning when overnight refreezing has suppressed overnight melt contributions. By Sunday afternoon after a 72°F day, any channel fed by remaining snowpack will be running higher than it was at dawn.

No active fires within 50 miles, air quality is a non-issue. With nearly 15 hours of daylight and a stable, sunny forecast through Monday, you have a wide scheduling margin. Make morning your priority for any snow travel or crossing of significant drainages, and enjoy the long evenings — golden hour runs until 9:08 PM all weekend.